1. (2021九上·平阳期中) 用方框中所给单词的适当形式填空，每词限用一次。

reply    simply    twenty    pollute     decision

1. （1） Mike is kind because he is always ready to help others.
3. （2） I think it was a good that we were allowed to go on a school trip last week.
5. （3） Mr. Green lives on the floor so he uses the lift to go up and down every day.
7. （4） The air in their city seriously because of more and more cars running on the road.
9. （5） Sara to Tom's letter already. Now, she is looking forward to hearing from him again.